Hi dhonu121:

Since the confusion is between 3) and 4), I will only concentrate on these two.

First off the question stem is testing parallelism. The increase in X coupled with .... Increase in Y is the correct parallel idiom.
There are two problems with choosin 4) as the "best" choice
a. It is not parallel. Now, as you have done, we could disregard it sometimes but we do have a better answer in 3)
b. It is awkward with a semi-dangling modifier. "significantly" increased retail prices as well as energy costs. It is not not clear whether the adverb "significantly" modifies energy costs also, which makes for an awkward construction. 3) fixes this with the use of "both"

This is why 4) is not the best answer. This should clear up the reasons for choosing 3) as the best answer.

Now, since you raised the question, I would like to talk about the meaning change, if any.

. Look at the following two phrases
i. The increased prices
ii. The increase in the prices

Both are in the simple past tense.

In our example , the two phrases discussed require a main clause to set up the tense. By themselves, the DO NOT tell us the tense. It is decided by the main clause.

Now let me use the phrases above in sentences.

A. The increased prices led to a war. Simple past
B. The increase in prices lead to a war. Simple past
C. The increased prices lead to wars. Simple present
D. The increase in prices leads to wars. Simple present

As you can see above, phrases by themselves do not tell us the tense.

Let me know if this helps

eagleeye wrote:Hi dhonu121:

Since the confusion is between 3) and 4), I will only concentrate on these two.

First off the question stem is testing parallelism. The increase in X coupled with .... Increase in Y is the correct parallel idiom.
There are two problems with choosin 4) as the "best" choice
a. It is not parallel. Now, as you have done, we could disregard it sometimes but we do have a better answer in 3)
b. It is awkward with a semi-dangling modifier. "significantly" increased retail prices as well as energy costs. It is not not clear whether the adverb "significantly" modifies energy costs also, which makes for an awkward construction. 3) fixes this with the use of "both"

This is why 4) is not the best answer. This should clear up the reasons for choosing 3) as the best answer.

Now, since you raised the question, I would like to talk about the meaning change, if any.

. Look at the following two phrases
i. The increased prices
ii. The increase in the prices

Both are in the simple past tense.

In our example , the two phrases discussed require a main clause to set up the tense. By themselves, the DO NOT tell us the tense. It is decided by the main clause.

Now let me use the phrases above in sentences.

A. The increased prices led to a war. Simple past
B. The increase in prices lead to a war. Simple past
C. The increased prices lead to wars. Simple present
D. The increase in prices leads to wars. Simple present

As you can see above, phrases by themselves do not tell us the tense.

Let me know if this helps

Thanks mate for taking out time to write such a long post..
However, I have a few reservations regarding your explanation.
Are you saying that
A. The increased prices led to a war. and

B. The increase in prices lead to a war.
convey the same meaning ?
No, rite ?
On similar reasoning the two usages in 3 and 4 do NOT convey same meaning and 3 conveys meaning different from that conveyed by the sentence originally.
However, I do agree that parallelism in 4 is not as good as it is in 3 and that is the reason y 3 is correct.

Thoughts ?